I have seen a few people saying B has point deadlines throughout the week, how are these different to code As? All I know is that full marks is only achievable if both codes are decoded succesfully in two days so Friday midnight.
Part A does not have time deadlines throughout the week, just points for accuracy. Now, if you solve a before b (which is recommended, as there can be hints in part a to help with part b), then yes you would need to solve them both before the first deadline to get full marks.